Tooth #31 – Lower right second molar
7th tooth back from the middle, lower right.
- International
- 47
- Palmer
- 7
- Type
- Molar
- Roots
- 2
- Canals
- usually 3
- Comes in
- 11–13 years
The big back tooth between the first molar and the wisdom tooth on the lower right.
- In front: #30 lower right first molar
- Behind: #32 lower right wisdom tooth
- Same tooth on the other side: #18 lower left second molar
- Bites against: #2 upper right second molar
None. Adult molars come in behind the baby teeth instead of replacing one.
Usually two roots (1–3) and usually three canals (2–4).
Lower second molars: roots, canals and the studies behind the counts →
This tooth is #31 in the US and 47 in the international (FDI) system, where the 4 means the lower right quarter and the 7 is its place counting from the front.
In the international system, 31 is the lower left central incisor (#24).
American Dental Association 2024; Harris 2005; American Dental Association 2012. Full titles are on the About page.